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// Lzx86Converter.cpp
#include "StdAfx.h"
#include "../../Common/Defs.h"
#include "Lzx86Converter.h"
namespace NCompress {
namespace NLzx {
static const UInt32 kResidue = 6 + 4;
void Cx86ConvertOutStream::MakeTranslation()
{
if (_pos <= kResidue)
return;
UInt32 numBytes = _pos - kResidue;
Byte *buf = _buf;
for (UInt32 i = 0; i < numBytes;)
{
if (buf[i++] == 0xE8)
{
Int32 absValue = 0;
unsigned j;
for (j = 0; j < 4; j++)
absValue += (UInt32)buf[i + j] << (j * 8);
Int32 pos = (Int32)(_processedSize + i - 1);
if (absValue >= -pos && absValue < (Int32)_translationSize)
{
UInt32 offset = (absValue >= 0) ?
absValue - pos :
absValue + _translationSize;
for (j = 0; j < 4; j++)
{
buf[i + j] = (Byte)(offset & 0xFF);
offset >>= 8;
}
}
i += 4;
}
}
}
STDMETHODIMP Cx86ConvertOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (!_translationMode)
return _stream->Write(data, size, processedSize);
UInt32 realProcessedSize = 0;
while (realProcessedSize < size)
{
UInt32 writeSize = MyMin(size - realProcessedSize, kUncompressedBlockSize - _pos);
memcpy(_buf + _pos, (const Byte *)data + realProcessedSize, writeSize);
_pos += writeSize;
realProcessedSize += writeSize;
if (_pos == kUncompressedBlockSize)
{
RINOK(Flush());
}
}
if (processedSize)
*processedSize = realProcessedSize;
return S_OK;
}
HRESULT Cx86ConvertOutStream::Flush()
{
if (_pos == 0)
return S_OK;
if (_translationMode)
MakeTranslation();
UInt32 pos = 0;
do
{
UInt32 processed;
RINOK(_stream->Write(_buf + pos, _pos - pos, &processed));
if (processed == 0)
return E_FAIL;
pos += processed;
}
while (pos < _pos);
_processedSize += _pos;
_pos = 0;
_translationMode = (_translationMode && (_processedSize < ((UInt32)1 << 30)));
return S_OK;
}
}}
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